Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J103/00—Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
  • C09J103/02—Starch; Degradation products thereof, e.g. dextrin
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/54—Inorganic substances

Definitions

• the present invention relates to silicate-dextrin adhesive compositions and process for producing the same.
• Aqueous alkali metal silicates particularly sodium silicates
• binders in coatings and as adhesives for solid fiber and corrugated boxes and cartons and plywood manufacture. They are versatile adhesives, combining convenience for use with strength and rigidity.
• strong adhesives combining convenience for use with strength and rigidity.
• paper products such as paper tubes, they do not provide sufficient initial tack and may cause breakdown of the manufacturing process.
• Dextrin and modified dextrins have also been used as adhesives for various applications, including many uses in the paper industry. While these adhesives quickly develop initial tack, they are difficult to clean from the processing machinery. They also do not have the strength and rigidity which the silicate-type adhesives have, and their use is rather limited in the paper industry where strength and rigidity are required.
• the addition of the clay slurry renders the adhesive composition thixotropic and prevents floating out of the dextrin from the adhesive composition.
• the object of the present invention is to provide a silicate-dextrin based adhesive composition having superior initial tack, adhesive strength and other desirable characteristics heretofore not quite satisfactorily provided for use in the paper industry including but not limited to tube winding, corrugated boards and comer boards.
• the adhesive composition of the present invention comprises a mixture of:
• the adhesive composition of the present invention is prepared by the following steps, the order of which is critical:
• the adhesive composition so prepared may be stored at any temperature, including temperatures below freezing, as long as the temperature is maintained below 38°C.
• the components are readily available commercially and may also be prepared by methods known in the art.
• Sodium metasilicate is well known and used commercially and is described, for example, by Faith, Keyes & Clarks' Industrial Chemicals, F.A. Lowenheim, M.K. Moran, Eds.; Wiley-Interscience, New York, 4th Ed., 1975, pp. 755-761.
• Sodium silicate in dry form of Na ⁇ SiOs, Na ⁇ Si2 ⁇ 7 and Na 2 SiaO 7 having a 2.0 to 5.5 ratio of SiO ⁇ to Na2 ⁇ is preferred for use in the adhesive compositions of the present invention.
• sodium silicate solutions may also be used, in which case the water content of the solution should be considered so that the above- identified composition ranges are satisfied.
• Sodium metaborate octahydrate is also available commercially and is made by fusing borax and sodium carbonate.
• Dextrin is available in various forms such as canary yellow and white dextrin and is produced by the dry heating of unmodified starches. It is preferred to use white dextrin for certain paper end products, and the highly soluble linear dextrin sold under the trademark AMAIZO® 1752-S Dextrin sold by American Maize- Products Co., Hammond, Indiana.
• Example 1 Five-tenths (0.5) gram of sodium metasilicate is dissolved in 35 grams of water followed by the addition of 65 grams of dextrin with stirring. Then 23.08 grams of the mix is added to 76.92 grams of silicate and mixed with stirring until the mixture becomes homogeneous. Then 0.30 grams of sodium metaborate octahydrate is added and mixed well with the homogeneous mixture at room temperature.
• One-tenth (0.1) gram of sodium metasilicate is dissolved in 35 grams of water followed by the addition of 65 grams of dextrin with stirring. Then 46.15 grams of this mix is added to 38.36 grams of potassium silicate, 0.35 gram of sodium metaborate octahydrate and 15.03 grams of water. The ingredients are mixed at room temperature until the mixture becomes homogeneous.
• Example 5 Five-tenths (0.5) gram of sodium metasilicate is dissolved in 35 grams of water followed by the addition of 50 grams of dextrin with stirring. Thirty (30) grams of this mix is added to 70 grams of sodium silicate. The ingredients are mixed at room temperature until the mixture becomes homogeneous.
• Example 6 Three tenths (0.3) gram of sodium metasilicate is dissolved in 35 grams of water followed by the addition of 20 grams of dextrin with stirring. Twenty (20) grams of this mix is added to 79.7 grams of sodium silicate and 0.3 gram of sodium metaborate octahydrate. The ingredients are mixed at room temperature until the mixture becomes homogeneous.
• the adhesive formulations of the present invention are utilized in making paper products, such as paper tubes, corrugated boards and angle boards, comprising layers of paper adhered to each other by the adhesive formulation.
• the properties of the final product are a function of the paper used, number of layers of the paper and the particular adhesive used. It was found that an adhesive formulation of the present invention having a solids content of from about 30% w/w to about 44% w/w is required to satisfy the various requirements in the final product. Experiments performed using various solids contents in the formulations showed the following viscosities which indicate the operable utility range. Table 2 shows percent solids content and associated viscosities of Examples 9-14, the preparations of which are analogous to Examples 1-7.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Adhesives Or Adhesive Processes (AREA)

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• 1996
  • 1996-02-28 US US08/607,905 patent/US5571316A/en not_active Expired - Fee Related
  • 1996-06-28 EP EP96924304A patent/EP0883657A4/de not_active Withdrawn
  • 1996-06-28 AU AU64791/96A patent/AU6479196A/en not_active Abandoned
  • 1996-06-28 CA CA002247385A patent/CA2247385A1/en not_active Abandoned
  • 1996-06-28 WO PCT/US1996/010974 patent/WO1997031986A1/en not_active Application Discontinuation
  • 1996-11-04 US US08/743,117 patent/US5776242A/en not_active Expired - Fee Related

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